Steam-boiler



4 Sheets-Sheet 1.

("No Model.)

s. E. LIGHT. STEAM BOILER.

No. 582,019. Patented May 4, 1897.

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S. E. LIGHT. STEAM BOILER.

Patented May 4', 1897.

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LIGHT. STEAM BOILER. No. 582,019. I Patented May 4, 1897.

Win E5 5 E5 T ATES SAMUEL E. LIGHT, OF LEBANON, PENNSYLVANIA.

STEAIV|-BOILER.

SPECIFICATION formingpart of Letters Patent No. 582,019, dated May 4, 1897.

Application filed $eptember 25,1896. Serial No. 606,985. (No model.)

To aZZ whom it may concern.-

Be it known that I, SAMUEL E. LIGHT, a citizen of the United States, residing at Lebanon, in the county of Lebanon and State of Pennsylvania, have invented certain new and useful Improvements in Steam-Boilers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to steam-boilers, has for its object the rapid generation of steam, and consists in certain improvements in construction which will be fully disclosed in the following specification and claims.

In the accompanying drawings, which formpart of this specification, Figure lrepresents a side elevation, partly in section, of my invention; Fig. 2, a vertical section on an enlarged scale and at a right angle to Fig. 1; Fig. 3, a transverse section on line 3 3, Fig. Fig. 4, a vertical section on line 4 l, Fig. Fig. 5, a transverse section on line 5 5, Fig. Fig. 6, a transverse section on line 7 7, Fig. and Fig. 7, a perspective of the lower header detached.

Reference being had to the drawings and the letters thereon, A indicates the upper header or drum; B, the lower header; 0, the fire-tubes, and D the water tubes which connect the two headers; E, fire-tubes connectin g the two heads or ends of the upper header or drum; F F, the water-circulating pipes communicating with the lower end of the upper header A and with the upper end of the lower header B; G G, the feed-water pipes; II II, the filters; I, the furnace; K, the gratebars; L, the combustion chamber; M, the masonry; N, the casing or'covering of heatnon-conducting material, and O the watercirculating pipe supporting the covering.

The lower header B is cylindrical at its upper end and provided with a fiat circular top or upper tube-sheet a, to which the watertubes D are secured at their lower ends, an arched bottom or lower tube-sheet b, to which the fire-tubes C are secured at their lower ends, and with water-legs c 0, whose outer surfaces (1 are cylindrical and conform with the contour of the upper end of the header, and the inner surfaces e are flat, forming sides to a portion of the furnace I, the remaining or that portion of the sides beyond the waterlegs being formed by the masonry M, as shown in Fig. 7.

The header B is preferably. formed of a continuous and seamless body of cast-steel of sufficient thickness to resist the strain brought to bear upon it, and thus prevent'the possibility of leaks, and on opposite sides and near the upper end of the header are attached Ts f f, to whose lower ends the filters II are attached and to the upper ends the circulatingpipes F F are attached by collars g g and glands h h, forming expansion-joints for the pipes, and the upper ends of said pipes F are attached to the lower ends of Ts i? a, connected to the lower end and on opposite sides of the upper header A. The pipes F F provide perfect and rapid circulation of the water in the boiler bet-ween the upper and, lower headers, the circulation being accelerated by the cold feed water passing through the pipes G G within and concentric to the pipes F F.

The grate-bars K extend beyond the waterlegs 0 c, and are supported at their ends by the masonry M, as shown in Figs. 1 and 7. Above the header B is a combustion-chainber L, from which the products of combustion pass up around the water-tubes D and through the fire-tubes E to the stack, (not shown,) which rests upon the upper end of the header A, and the products of combustion under the crown of the furnace formed by the lower tube-sheet of the lower header pass through the fire-tubes C on up through the upper header or drum A, where they serve to superheat the steam in the header above the Water-line.

The water in the tubes D is in a thin annular body subjected to the heat of the products of combustion within the fire'tubes and around the tubes D, while a large number of the water-tubes have their outer surfaces eX- posed directly to the products of combustion in the combustion-chamber L, thus effecting a rapid generation of steam.

The filters H are provided with upper and lower perforated plates or diaphragms 7c, between which is formed a chamber Z, containing a suitable filtering medium, such as charcoal, coke, or any well-known filtering material. The pipes G extend through the filtering-chambers Z and discharge into the chambers m m below the lower plates 7c, in which the grosser impurities of the water are deposited, and the water rises through the filtering material in the chamber 1 and flows through branches 0 of Ts f into the header B. The sediment which accumulates in the water-legs c c and the impurities in the chambers m m are discharged through suitable blow-off cocks or pipes. (Not shown.)

Surrounding the tubes 0 D between the masonry M and the lower end of the header B is a water-circulating support 0 for the casing or covering N, of suitable heat-nonconducting material, which may be applied in sections. The support consists of an upper annular pipe 19 and a lower annular pipe q, between which are pipes to, connecting them, and from the lower pipe q lateralpipes v Q? connect with the main circulating-pipes F, so that the support for the covering forms an auxiliary circulating system for the water in the boiler, and in which the wateris exposed to the heat of the products of combustion passing from the lower to the upper header and produces rapid circulation and greatly augments the generation of steam in the boiler.

The fi rc-tubes C are provided at their upper end with an ogee or swell to to fill the openings in the upper tube-sheet of the header A, through which the water-tubes are passed to their respective openings in the lower tubesheet and to allow for the expansion and contraction of said tubes, and between said tubes are placed vertical baffle-plates 1 which are graduated in height from one side of the header to the steam-discharge pipe .2 to arrest and separate any water from the steam in its passage toward the steam-discharge pipe.

The baffle-plates are provided with narrow or reduced lower portions a, which rest upon the lower head or end of the header, so as not to interfere materially with the circulation of the water in the header, and said reduced portion of the battle-plates extends up to the normal water-line of the header. The upper portion above the water-line is provided with flanges b b, which engage the tubes 0 and secure the baffle-plates in position without any other means of fastening them, and the baffle-plates next to the discharge-opening of the header extend above the upper extremity of said opening, so that the dry steam must pass over it before it can reach the dischargeopening, as shown in Figs. 2 and 4.

Having thus fully disclosed my invention, what I claim is 1. A boiler-header having a circular and fiat top wall, an arched inner wall crossing the head, and vertical water-legs whose outer surfaces are circular and the inner surfaces flat and forming side walls for the furnace.

2. A steam-boiler having a header provided with water-legs whose inner surfaces form sides of the furnace, and grate-bars between and extending beyond said legs, in combination with a combustion-chamber on the ends and above said header.

3. A steam-boiler having an upper and a lower header, concentric fire and water tubes connecting the headers, the former tubes extending through both headers and separate fire-tubes extending through the upper header only, in combination with water-circulating pipes connecting the headers.

4. A steam-boiler having an upper and a lower header, concentric fire and water tubes connecting the headers and separate fire-tubes extending through the upper header only, in combination with water-circulating pipes connecting the headers and an auxiliary circulating system of pipes surrounding the fire and water tubes.

5, A steam-boiler having an upper and a lower header, connecting fire and water tubes and a suitable heat-retaining casing between the headers, in combination with water-circulating pipes connecting the headers, a feedwater pipe within each of the circulatingpipes and concentric thereto and a filter through which the feed-pipe passes and discharges below the filtering-chamber.

6. A steam-boiler having a header provided with vertical baffle-plates reduced in width at theirlower ends and extending into the steamspace of the header.

7. A steam-boiler having a header, firetubes extending through the header and baffie-plates graduated in height, reduced in width at their lower ends and provided with flanges at their upper ends engaging said tubes.

In testimony whereof I affix my signature in presence of two witnesses.

SAMUEL E. LIGHT.

Witnesses:

A. Hnss, T. K. OnownLL. 

